HYDROPAC/NAVTEX signal being blocked.

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Reece

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Location
Adelaide Australia
Having been monitoring NAVTEX/HYDROPAC broadcasts for many years am now disappointed since the signal seems to be blocked here in Burra South Australia.
Below is the schedule:

NRV GMDSS FEC BROADCAST

FREQUENCIES: 12579.0 KHZ
16806.5 KHZ
22376.0 KHZ

TIMES:
HYDROPAC BCST: 0230 AND 0900 UTC
WX BCST: 0500, 1500, 1900, AND 2315 UTC

NOTE: CARRIER OR DIAL FREQUENCY IS LOCATED 1700 HZ BELOW THE ASSIGNED
FREQUENCY (-1.7 KHZ).

This wideband interfering signal has been present since the 22nd of November on all 3 frequencies, I have 2 radios and am able to reduce the bandwidth to 400Hz with no success.
I have checked with a portable radio and the interfering signal is not local so that rules out RFI.
Has anyone else noticed this? does anyone have any idea where it is emanating from?
Any advise/help is appreciated.
 

zl2taw

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Joined
Mar 16, 2006
Messages
575
Location
Brisbane, Australia
caught on 22376khz@2130utc

NMC/NMO GMDSS SITOR FEC BROADCAST
FREQUE:83': 8416.5 KHZ
WT 12579.0 KHZ
22376.0 KHZ AT 0130, AND 2030 UTC ONLY.
3'58.3': 0130, 0730, 1330, AND 2030 UTC
NOTE: CARRIER OR DIAL FREQUENCY IS LOCATED 1700 HZ BELOW THE ASSIGNED
FREYUENCY (-1.7 KHZ).

there is a signal there but not strong enough to knock out the sitor transmission
btw I am in QLD, so it looks local to you
 

Reece

Member
Joined
Sep 2, 2012
Messages
20
Location
Adelaide Australia
That's weird, the interfering/jamming signal fades in and out, and it is on all 3 frequencies, has me baffled.
Not sure where to turn for help. Hopefully someone in SA will try it out and respond.

Edit:
I noticed that your station is NMC/NMO and your time 21:30, could you try for the HYDROPAC report at either 02:30 or 09:00 UTC, this would be station NRV at Guam? I assume you replied to me on AURFSCAN.
 
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majoco

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Dec 25, 2008
Messages
3,303
Location
New Zealand
Definitely an interfering signal centred on where I would have received the data - all three frequencies at 2140z. Not very strong, but then I haven't listened for the Sitor broadcast - doesn't move the "S" meter off the "1" on 12577.5khz.
 

Reece

Member
Joined
Sep 2, 2012
Messages
20
Location
Adelaide Australia
Response from NOAA

I sent an email to the NOAA marine weather department and have received the following in an email:

------------------------------------------------------------------
After several inquires and getting the word spread around the following
was issued. No prognosis on repair.

HYDROPAC 3950/13(GEN).
WESTERN NORTH PACIFIC.
MARIANA ISLANDS.
NAVTEX.
NAVTEX STATION GUAM OFF AIR.

------------------------------------------------------------------

Hopefully the problem will be rectified soon.


PS. Many thanks to those responsible for their support.
 
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